overlay-hacks kernel module to test overlay feature
- currently tries to overlay overlay-test.dtbo using request_firmware on insmod
- export of overlay functions required

Caution:
- make sure to compile the base dtb with -@ flag to dtc, stock kernel doesn't.
- make sure that nodes being referred to in the base have labels so that phandles are generated.

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
dtc: Generate phandles as a CRC of the label or path of a node

This has the advantage that for DT overlays, dynamic fixup of nodes
is not required. Also, nothing changes with the DT format so existing
systems should work.

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
dtc: Generate phandle as hash of reference

For non-existent node references, if -@ is passed, generate a hash of the reference.

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
DT Symbol Resolution roadmap

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>